html,body { width: 100%; height: 100%; overflow: hidden; margin: 0; padding: 0;}
#Engine { position: absolute; left: 50%; top: 50%; transform: translateX(-50%) translateY(-50%); background-color: #000;}
.FPS { position: absolute; width: 100px; height: 20px; line-height: 20px; background-color: #aaa; top: 0; right: 0;}
